Composite water pipe for unmanned aerial vehicle cleaning

Abstract

The invention relates to the field of pipelines, and particularly discloses an unmanned aerial vehicle cleaning composite water pipe which comprises a sheath outer layer, a power line structure, a communication line structure and a water pipe structure are arranged in the sheath outer layer, and the power line structure sequentially comprises a power line conductor layer, a power line insulating layer and a power line shielding layer from inside to outside. The communication line structure sequentially comprises a communication line conductor layer, a communication line insulating layer, an aluminum-plastic composite belt layer and a communication line shielding layer from inside to outside, the water pipe structure sequentially comprises a water pipe body, a woven reinforcing layer and a water pipe outer sheath from inside to outside, and flame-retardant foaming silicone rubber is filled between the power line structure, the communication line structure, the water pipe structure and the sheath outer layer. The power line structure, the communication line structure and the water pipe structure are integrated on the outer layer of the sheath, so that the working efficiency, the coverage range and the reliability of cleaning large facilities by the unmanned aerial vehicle are improved, the pipeline winding risk can be reduced, and troubleshooting during later maintenance is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipelines, more particularly, to a composite water pipe for unmanned aerial vehicle cleaning. BACKGROUND

[0002] With the rapid development of unmanned aerial vehicle technology, unmanned aerial vehicles have been widely used in industrial cleaning.

[0003] In traditional unmanned aerial vehicle cleaning operations, a suspended water tank is usually used for water supply. Due to the limitation of the load capacity of the unmanned aerial vehicle, the single operation time is short and the cleaning efficiency is low. In order to prolong the operation time, a ground water pump is used to supply water to the unmanned aerial vehicle through a water pipe in the related art. The unmanned aerial vehicle cleaning relies on the power supply of the on-board battery, and the endurance time of the battery is limited, which limits the range of single operation and makes it difficult to cover the full-area cleaning of large facilities. The cleaning efficiency is reduced due to the need for frequent return to replace the battery, which needs to be improved. SUMMARY

[0004] In order to improve the operation efficiency of unmanned aerial vehicle cleaning, the present application provides a composite water pipe for unmanned aerial vehicle cleaning.

[0005] The composite water pipe for unmanned aerial vehicle cleaning provided by the present application adopts the following technical solution:

[0006] A composite water pipe for unmanned aerial vehicle cleaning comprises a sheath outer layer, wherein the sheath outer layer is internally provided with a power line structure, a communication line structure and a water pipe structure, the power line structure comprises, from inside to outside, a power line conductor layer, a power line insulation layer and a power line shielding layer, the communication line structure comprises, from inside to outside, a communication line conductor layer, a communication line insulation layer, an aluminum-plastic composite tape layer and a communication line shielding layer, and the water pipe structure comprises, from inside to outside, a water pipe body, a woven reinforcing layer and a water pipe sheath.

[0007] By adopting the above technical solution, the ground water pump is connected through the water pipe structure to realize continuous water supply, eliminating the problem of small single operation area caused by water tank capacity limitation and the need for frequent return to supplement water. The power line structure is used to replace the on-board battery by taking power from the ground, prolonging the cleaning operation time, reducing the efficiency loss caused by frequent return to replace the battery, reducing the influence of the self-weight of the battery on the flight stability of the unmanned aerial vehicle, reducing the flight deviation caused by load fluctuation, and improving the cleaning positioning accuracy.

[0008] The communication line structure adopts a four-layer design, and the aluminum-plastic composite tape layer and the communication line shielding layer cooperate to shield the electromagnetic interference generated by the motor of the unmanned aerial vehicle and the external environment, reduce the communication signal attenuation rate, ensure the real-time transmission of cleaning control instructions and other signals, avoid the cleaning accuracy deviation or operation out of control caused by signal distortion, and at the same time, the communication line insulation layer can isolate water and current, reducing the risk of short circuit.

[0009] The foamed flame-retardant silicone rubber filling, on the one hand, the foamed structure can buffer the internal impact and external pressure, realize the buffering and fixing of each structure, avoid the pipeline wear caused by the flight bump of the unmanned aerial vehicle, and also help to reduce the overall weight of the composite water pipe; on the other hand, it has good flame-retardant performance, reduces the leakage of cleaning liquid in the water pipe body and the short circuit risk caused by the contact of the power line.

[0010] In summary, by integrating the power line structure, the communication line structure and the water pipe structure in the outer layer of the sheath, the operation efficiency, the coverage range and the reliability of the unmanned aerial vehicle for cleaning large facilities are improved, and the pipeline winding risk is also reduced, which is convenient for troubleshooting during later maintenance.

[0011] Preferably, the power line shielding layer and the communication line shielding layer are both tin-plated copper wire woven shielding layers.

[0012] Preferably, the flame-retardant foamed silicone rubber includes 100-110 parts by weight of methyl vinyl silicone rubber, 70-80 parts by weight of flame retardant, 3-5 parts by weight of four-needle zinc oxide whiskers, 3-5 parts by weight of azobisformamide, 1-2 parts by weight of sodium bicarbonate, 1.5-2 parts by weight of dicumyl peroxide, 10-15 parts by weight of white carbon black, 2-3 parts by weight of hydroxyl silicone oil, 0.5-1 part by weight of carbon black, and 0.3-0.5 part by weight of zinc stearate.

[0013] By adopting the above technical solution, the four-needle structure of the four-needle zinc oxide whisker can form a three-dimensional interlaced network in the silicone rubber, dispersing local stress to the overall structure, avoiding cracking caused by stress concentration, and improving the overall mechanical strength of the composite water pipe;

[0014] The flame-retardant foamed silicone rubber has a large number of pores, and the needle-shaped branches of the four-needle zinc oxide whisker can be embedded in the adjacent pore walls. When the unmanned aerial vehicle vibrates, the needle-shaped branches realize multidirectional micro-displacement through the elastic deformation of the pores, and consume vibration energy through the interface friction between the whisker and the matrix and the elastic deformation of the whisker itself, reducing the friction between the pipelines, thereby reducing the leakage and communication interruption caused by vibration wear;

[0015] The semiconductor property (conductivity between conductor and insulator) of the four-needle zinc oxide whisker can form a secondary insulation barrier when a small damage occurs in the power line insulation layer due to aging, avoiding electric leakage;

[0016] The needle-shaped whisker of the four-needle zinc oxide whisker can form multiple-point contact with the copper wire of the communication line shielding layer, prolonging the transmission path of the electromagnetic interference signal and thereby attenuating the strength of the electromagnetic interference signal, assisting the communication line shielding layer in shielding electromagnetic interference.

[0017] Preferably, the flame retardant includes aluminum hydroxide, microcapsule red phosphorus and nano magnesium hydroxide in a mass ratio of 10:1.2:0.8.

[0018] By adopting the above technical solutions, aluminum hydroxide dehydrates and cools down during combustion, inhibiting flame spread; microcapsule red phosphorus releases phosphorus free radicals to catalyze the formation of a dense carbon layer from silicone rubber; and nano-magnesium hydroxide has a high specific surface area, which can be uniformly dispersed in the form of nano-sized particles during combustion, filling the pores of the carbon layer, strengthening the integrity of the carbon layer, and inhibiting the collapse of the carbon layer. It contains no halogen components such as bromine and chlorine, and is low in smoke and toxicity, making it safe and environmentally friendly.

[0019] Preferably, the flame-retardant foamed silicone rubber contains at least one aramid rope extending along the length of the power line structure.

[0020] By adopting the above technical solution, the aramid rope, with its high tensile strength, extends along the length of the power line structure and can serve as a skeleton for the flame-retardant foamed silicone rubber, improving the overall tensile strength of the composite water pipe. When the drone takes off or the pipeline is dragged by the airflow, it reduces the damage to the power line shielding layer and the tearing of the flame-retardant foamed silicone rubber caused by stretching, ensuring the structural integrity of the composite water pipe. At the same time, the aramid rope can restrain the excessive deformation of the flame-retardant foamed silicone rubber, preventing the flame-retardant foamed silicone rubber from detaching from the power line surface due to excessive stretching, and ensuring its wrapping and cushioning effect on the power line.

[0021] Aramid rope has excellent chemical stability and is compatible with flame-retardant foamed silicone rubber and power cord shielding layers. It will not degrade due to contact with moisture or flame retardants and can maintain its reinforcing effect for a long time, which helps to extend the service life of composite water pipes.

[0022] Preferably, the insulation layer of the communication line is made of linear low-density polyethylene, and the insulation layer of the power line is made of polyvinyl chloride.

[0023] By adopting the above technical solutions, linear low-density polyethylene (LLDPE) possesses excellent flexibility, allowing it to flexibly deform with the movement of the pipeline during drone as it ascends, descends, and turns, reducing the risk of insulation layer cracking. Furthermore, its low dielectric loss reduces signal attenuation of control commands, ensuring communication stability. Additionally, LLDPE has a lower density than traditional rubber-based insulation materials, allowing for better control of the communication line's weight per meter and avoiding additional load on the drone. Polyvinyl chloride (PVC) exhibits excellent temperature and load resistance, tolerating temperature rises during power line operation. It also possesses excellent chemical resistance, showing no swelling or degradation even after prolonged contact with cleaning water and oil, ensuring stable long-term insulation performance of the power line.

[0024] Preferably, the braided reinforcing layer is a mesh reinforcing layer woven from aramid fibers, and the braiding angle of the braided reinforcing layer is 45°-55° and the coverage is ≥90%.

[0025] By adopting the above technical solutions, the high strength and cross-woven structure of aramid fibers can improve the tensile, impact and wear resistance of composite water pipes. The high coverage can form a reliable explosion-proof protection barrier, which can restrict the expansion of cracks on the water pipe body and maintain its structural stability in the long term. At the same time, it is lighter than traditional metal reinforcement layers and retains good flexibility, which can meet the safety requirements and operational flexibility of drone cleaning scenarios.

[0026] Preferably, the outer layer of the sheath is made of polyurethane, and the outer sheath of the water pipe is made of TPU.

[0027] By adopting the above technical solutions, the strong weather resistance, wear resistance and flexibility of polyurethane can ensure the overall environmental adaptability of composite water pipes. In addition, the water resistance, pressure resistance and flame retardancy of TPU can meet the water supply safety requirements of water pipes and the safety and usage requirements of drone cleaning scenarios.

[0028] 1. This application improves the efficiency, coverage and reliability of drone cleaning of large facilities by integrating the power line structure, communication line structure and water pipe structure in the outer sheath, and also reduces the risk of pipeline entanglement and facilitates troubleshooting during later maintenance.

[0029] 2. In this application, flame-retardant foamed silicone rubber containing four-needle zinc oxide whiskers is preferred. The four-needle structure of the four-needle zinc oxide whiskers can form a three-dimensional interwoven network in the silicone rubber, which can improve the overall mechanical strength of the composite water pipe. Its needle-like branches can also be embedded in the adjacent foam walls of the flame-retardant foamed silicone rubber, which can consume vibration energy and reduce leakage and communication interruption faults caused by friction and vibration wear between pipelines. At the same time, its semiconductor properties can form a secondary insulation barrier to prevent leakage when the power line insulation layer ages and breaks. The multi-point contact between the needle-like whiskers and the copper wire of the communication line shielding layer can also extend the transmission path of electromagnetic interference signals, help attenuate the interference intensity and enhance the shielding effect.

[0030] 3. This application uses aramid rope embedded in flame-retardant foamed silicone rubber to enhance the tensile strength of the composite water pipe as a skeleton of the flame-retardant foamed silicone rubber. This reduces the damage to the power line shielding layer and the tearing of the silicone rubber caused by drone take-off or airflow dragging. At the same time, it restrains excessive deformation of the silicone rubber to prevent it from detaching from the power line, ensuring the wrapping and cushioning effect. Moreover, its excellent chemical stability can maintain the reinforcing effect for a long time and extend the service life of the composite water pipe. Attached Figure Description

[0031] Figure 1 This is a cross-sectional view of the composite water pipe of this application;

[0032] Explanation of reference numerals in the attached drawings: 1. Outer sheath; 2. Power cord structure; 21. Power cord conductor layer; 22. Power cord insulation layer; 23. Power cord shielding layer; 3. Communication cord structure; 31. Communication cord conductor layer; 32. Communication cord insulation layer; 33. Aluminum-plastic composite tape layer; 34. Communication cord shielding layer; 4. Water pipe structure; 41. Water pipe body; 42. Braided reinforcement layer; 43. Water pipe outer sheath; 5. Flame-retardant foamed silicone rubber; 6. Aramid rope. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1 The present application will be further described in detail with reference to the embodiments.

[0034] Information Methyl vinyl silicone rubber Vinyl content (mo1%): 1.0%-1.2% Microcapsule red phosphorus Model: ZP-H01 Tetrapod-shaped zinc oxide whisker Needle arm length: 8-12 μm, needle arm diameter: 1.0-1.2 μm White carbon black Fumed white carbon black, particle size: 10-20 nm Hydroxyl silicone oil Hydroxyl mass: 0.8%-1.0% Carbon black Particle size: 20-50 nm Nano magnesium hydroxide Particle size: 50-100 nm Linear low density polyethylene Grade: Dow 2045G Polyvinyl chloride Model: J-70 Polyurethane Model: Desmopan 385E TPU Model: Bayer 9380A, Germany

[0035] Unless otherwise specified, all raw materials used in the following embodiments are commercially available.

[0036] Example

[0037] Example 1

[0038] This application discloses a composite water pipe for cleaning drones. The overall outer diameter of the composite water pipe is 20mm, including an outer sheath 1 with a thickness of 1.5mm. The outer sheath 1 is made of polyurethane.

[0039] The outer sheath 1 contains a power cord structure 2, a communication line structure 3, and a water pipe structure 4. The space between the power cord structure 2, the communication line structure 3, and the water pipe structure 4 and the outer sheath 1 is filled with flame-retardant foamed silicone rubber 5. The flame-retardant foamed silicone rubber 5 comprises the following raw materials in parts by weight: 100 parts methyl vinyl silicone rubber, 70 parts flame retardant, 3 parts tetraneedle-shaped zinc oxide whiskers, 3 parts azodicarbonamide, 1 part sodium bicarbonate, 1.5 parts dicumyl peroxide, 10 parts silica, 2 parts hydroxyl silicone oil, 0.5 parts carbon black, and 0.3 parts zinc stearate. The flame retardant comprises aluminum hydroxide, microencapsulated red phosphorus, and nano magnesium hydroxide in a mass ratio of 10:1.2:0.8.

[0040] The flame-retardant foamed silicone rubber 5 was prepared as follows: First, fumed silica was vacuum dried at 120℃ for 2 hours. Then, tetra-needle zinc oxide whiskers were modified with KH-550 silane coupling agent at 80℃ for 30 minutes. The amount of KH-550 silane coupling agent added was 1% of the mass of the tetra-needle zinc oxide whiskers.

[0041] Then, aluminum hydroxide, microcapsule red phosphorus, and nano magnesium hydroxide are mixed at 1800 rpm and 65°C for 12 minutes to obtain a flame retardant premix.

[0042] First, mix silica and carbon black for 5 minutes, then add modified whiskers and mix at 1500 rpm and 55℃ for 10 minutes to obtain functional filler premix.

[0043] Hydroxysilicone oil and zinc stearate were mixed at room temperature for 8 minutes to obtain an additive premix.

[0044] Subsequently, the methyl vinyl silicone rubber was plasticized at 45°C for 6 minutes, and the functional filler premix was added in 3 batches and mixed for 12 minutes. Then, the additive premix was added and mixed at 60°C for 8 minutes, and the flame retardant premix was mixed for 10 minutes.

[0045] After cooling to 35℃, sodium bicarbonate was added and mixed for 4 minutes, azodicarbonamide for 5 minutes, and dicumyl peroxide for 4 minutes. Finally, the rubber compound, power line structure 2, communication line structure 3 (integrated into a cable bundle), and aramid rope 6 were simultaneously fed into an extruder (extrusion temperature 165℃, screw speed 35r / min). After vulcanization at 175℃ for 7 minutes, the flame-retardant foamed silicone rubber 5 filling layer inside the composite water pipe was obtained.

[0046] At least one aramid rope 6 is embedded in the flame-retardant foamed silicone rubber 5, extending along the length of the power line structure 2. The diameter of the aramid rope 6 is 1 mm, and the distance between it and the power line structure 2 and the communication line structure 3 is ≥ 2 mm. In this embodiment, one aramid rope 6 is embedded in the flame-retardant foamed silicone rubber 5.

[0047] The power cord structure 2 has a total outer diameter of 2.7 mm. From the inside out, the power cord structure 2 includes a power cord conductor layer 21, a power cord insulation layer 22, and a power cord shielding layer 23. The communication cord structure 3 has a total outer diameter of 2.0 mm. From the inside out, the communication cord structure 3 includes a communication cord conductor layer 31, a communication cord insulation layer 32, an aluminum-plastic composite tape layer 33, and a communication cord shielding layer 34.

[0048] The power cord conductor layer 21 is made of 0.2mm tin-plated electrolytic copper wire, 49 strands twisted together, with each core being 0.75mm thick. 2 The communication line conductor layer 31 is made of 0.1mm tin-plated oxygen-free copper wire, 24 strands twisted together, with each core being 0.15mm thick. 2 The power cord insulation layer 22 is made of polyvinyl chloride with a thickness of 0.9 mm, the communication line insulation layer 32 is made of linear low-density polyethylene with a thickness of 1.1 mm, the power cord shielding layer 23 and the communication line shielding layer 34 are both tin-plated copper wire braided shielding layers with a diameter of 0.12 mm, a braiding density of 90%, and a braiding angle of 35°.

[0049] The water pipe structure 4 includes, from the inside out, a water pipe body 41, a braided reinforcement layer 42, and a water pipe outer sheath 43. The water pipe body 41 has an inner diameter of 5 mm and a layer thickness of 0.8 mm. The water pipe body 41 is made of thermoplastic polyurethane elastomer. The braided reinforcement layer 42 is a mesh reinforcement layer woven from aramid fibers. The diameter of the aramid fiber monofilament is 0.1 mm, the braiding mesh number is 20 meshes / inch, the braiding angle of the braided reinforcement layer 42 is 45°, and the coverage is ≥90%. The water pipe outer sheath 43 is made of TPU and has a layer thickness of 0.5 mm.

[0050] In practical use, a certain length of the outer sheath 1, flame-retardant foamed silicone rubber 5 filling layer, and the corresponding power and communication line outer sheaths of both ends of the composite water pipe are peeled off to expose the internal power line conductor layer 21, communication line conductor layer 31, and water pipe structure 4. An integrated terminal board is installed on the UAV fuselage and ground equipment box. The integrated terminal board integrates a power interface, a communication interface, and a water interface. The power line conductor and communication line conductor of the composite water pipe are respectively connected to / inserted into the corresponding power interface and communication interface on the integrated terminal board, and the end of the water pipe structure 4 is connected to the water interface.

[0051] During operation, the operator only needs to connect and fix the treated ends of the composite water pipe to the integrated terminal board on the ground and the drone, respectively. In this way, the power supply, communication and water channels integrated inside the composite water pipe of the present invention can be connected separately and independently, thereby providing the drone with continuous power, control signals and cleaning medium, and realizing long-term uninterrupted operation.

[0052] Example 2

[0053] This application discloses a composite water pipe for cleaning drones. The overall outer diameter of the composite water pipe is 20mm, including an outer sheath 1 with a thickness of 1.5mm. The outer sheath 1 is made of polyurethane.

[0054] The outer sheath 1 contains a power cord structure 2, a communication line structure 3, and a water pipe structure 4. The space between the power cord structure 2, the communication line structure 3, and the water pipe structure 4 and the outer sheath 1 is filled with flame-retardant foamed silicone rubber 5. The flame-retardant foamed silicone rubber 5 comprises the following raw materials in parts by weight: 110 parts methyl vinyl silicone rubber, 80 parts flame retardant, 5 parts tetraneedle-shaped zinc oxide whiskers, 5 parts azodicarbonamide, 2 parts sodium bicarbonate, 2 parts dicumyl peroxide, 15 parts silica, 3 parts hydroxyl silicone oil, 1 part carbon black, and 0.5 parts zinc stearate. The flame retardant includes aluminum hydroxide, microcapsule red phosphorus, and nano magnesium hydroxide in a mass ratio of 10:1.2:0.8.

[0055] The flame-retardant foamed silicone rubber 5 was prepared as follows: First, fumed silica was vacuum dried at 120℃ for 2 hours. Then, tetra-needle zinc oxide whiskers were modified with KH-550 silane coupling agent at 80℃ for 30 minutes. The amount of KH-550 silane coupling agent added was 1% of the mass of the tetra-needle zinc oxide whiskers.

[0056] Then, aluminum hydroxide, microcapsule red phosphorus, and nano magnesium hydroxide are mixed at 1800 rpm and 65°C for 12 minutes to obtain a flame retardant premix.

[0057] First, mix silica and carbon black for 5 minutes, then add modified whiskers and mix at 1500 rpm and 55℃ for 10 minutes to obtain functional filler premix.

[0058] Hydroxysilicone oil and zinc stearate were mixed at room temperature for 8 minutes to obtain an additive premix.

[0059] Subsequently, the methyl vinyl silicone rubber was plasticized at 45°C for 6 minutes, and the functional filler premix was added in 3 batches and mixed for 12 minutes. Then, the additive premix was added and mixed at 60°C for 8 minutes, and the flame retardant premix was mixed for 10 minutes.

[0060] After cooling to 35℃, sodium bicarbonate was added and mixed for 4 minutes, azodicarbonamide for 5 minutes, and dicumyl peroxide for 4 minutes. Finally, the rubber compound, power line structure 2, communication line structure 3 (integrated into a cable bundle), and aramid rope 6 were simultaneously fed into an extruder (extrusion temperature 165℃, screw speed 35r / min). After vulcanization at 175℃ for 7 minutes, the flame-retardant foamed silicone rubber 5 filling layer inside the composite water pipe was obtained.

[0061] At least one aramid rope 6 extending along the length of the power line structure 2 is embedded in the flame-retardant foamed silicone rubber 5. The diameter of the aramid rope 6 is 1 mm, and the distance between it and the power line structure 2 and the communication line structure 3 is ≥ 2 mm. In this embodiment, two aramid ropes 6 are embedded in the flame-retardant foamed silicone rubber 5.

[0062] The power cord structure 2 has a total outer diameter of 2.7 mm. From the inside out, the power cord structure 2 includes a power cord conductor layer 21, a power cord insulation layer 22, and a power cord shielding layer 23. The communication cord structure 3 has a total outer diameter of 2.0 mm. From the inside out, the communication cord structure 3 includes a communication cord conductor layer 31, a communication cord insulation layer 32, an aluminum-plastic composite tape layer 33, and a communication cord shielding layer 34.

[0063] The power cord conductor layer 21 is made of 0.2mm tin-plated electrolytic copper wire, 49 strands twisted together, with each core being 0.75mm thick. 2 The communication line conductor layer 31 is made of 0.1mm tin-plated oxygen-free copper wire, 24 strands twisted together, with each core being 0.15mm thick. 2The power cord insulation layer 22 is made of polyvinyl chloride with a thickness of 0.9 mm, the communication line insulation layer 32 is made of linear low-density polyethylene with a thickness of 1.1 mm, the power cord shielding layer 23 and the communication line shielding layer 34 are both tin-plated copper wire braided shielding layers with a diameter of 0.12 mm, a braiding density of 90%, and a braiding angle of 35°.

[0064] The water pipe structure 4 includes, from the inside out, a water pipe body 41, a braided reinforcement layer 42, and a water pipe outer sheath 43. The water pipe body 41 has an inner diameter of 5 mm and a layer thickness of 0.8 mm. The water pipe body 41 is made of thermoplastic polyurethane elastomer. The braided reinforcement layer 42 is a mesh reinforcement layer woven from aramid fibers. The diameter of the aramid fiber monofilament is 0.1 mm, the braiding mesh number is 20 meshes / inch, the braiding angle of the braided reinforcement layer 42 is 55°, and the coverage is ≥90%. The water pipe outer sheath 43 is made of TPU and has a layer thickness of 0.5 mm.

[0065] In practical use, a certain length of the outer sheath 1, flame-retardant foamed silicone rubber 5 filling layer, and the corresponding power and communication line outer sheaths of both ends of the composite water pipe are peeled off to expose the internal power line conductor layer 21, communication line conductor layer 31, and water pipe structure 4. An integrated terminal board is installed on the UAV fuselage and ground equipment box. The integrated terminal board integrates a power interface, a communication interface, and a water interface. The power line conductor and communication line conductor of the composite water pipe are respectively connected to / inserted into the corresponding power interface and communication interface on the integrated terminal board, and the end of the water pipe structure 4 is connected to the water interface.

[0066] During operation, the operator only needs to connect and fix the treated ends of the composite water pipe to the integrated terminal board on the ground and the drone, respectively. In this way, the power supply, communication and water channels integrated inside the composite water pipe of the present invention can be connected separately and independently, thereby providing the drone with continuous power, control signals and cleaning medium, and realizing long-term uninterrupted operation.

[0067] Example 3

[0068] This application discloses a composite water pipe for cleaning drones. The overall outer diameter of the composite water pipe is 20mm, including an outer sheath 1 with a thickness of 1.5mm. The outer sheath 1 is made of polyurethane.

[0069] The outer sheath 1 contains a power cord structure 2, a communication line structure 3, and a water pipe structure 4. The space between the power cord structure 2, the communication line structure 3, and the water pipe structure 4 and the outer sheath 1 is filled with flame-retardant foamed silicone rubber 5. The flame-retardant foamed silicone rubber 5 comprises the following raw materials in parts by weight: 105 parts methyl vinyl silicone rubber, 75 parts flame retardant, 4 parts tetraneedle-shaped zinc oxide whiskers, 4 parts azodicarbonamide, 1 part sodium bicarbonate, 1.5 parts dicumyl peroxide, 13 parts silica, 2 parts hydroxyl silicone oil, 0.5 parts carbon black, and 0.4 parts zinc stearate. The flame retardant comprises aluminum hydroxide, microencapsulated red phosphorus, and nano magnesium hydroxide in a mass ratio of 10:1.2:0.8.

[0070] The flame-retardant foamed silicone rubber 5 was prepared as follows: First, fumed silica was vacuum dried at 120℃ for 2 hours. Then, tetra-needle zinc oxide whiskers were modified with KH-550 silane coupling agent at 80℃ for 30 minutes. The amount of KH-550 silane coupling agent added was 1% of the mass of the tetra-needle zinc oxide whiskers.

[0071] Then, aluminum hydroxide, microcapsule red phosphorus, and nano magnesium hydroxide are mixed at 1800 rpm and 65°C for 12 minutes to obtain a flame retardant premix.

[0072] First, mix silica and carbon black for 5 minutes, then add modified whiskers and mix at 1500 rpm and 55℃ for 10 minutes to obtain functional filler premix.

[0073] Hydroxysilicone oil and zinc stearate were mixed at room temperature for 8 minutes to obtain an additive premix.

[0074] Subsequently, the methyl vinyl silicone rubber was plasticized at 45°C for 6 minutes, and the functional filler premix was added in 3 batches and mixed for 12 minutes. Then, the additive premix was added and mixed at 60°C for 8 minutes, and the flame retardant premix was mixed for 10 minutes.

[0075] After cooling to 35℃, sodium bicarbonate was added and mixed for 4 minutes, azodicarbonamide for 5 minutes, and dicumyl peroxide for 4 minutes. Finally, the rubber compound, power line structure 2, communication line structure 3 (integrated into a cable bundle), and aramid rope 6 were simultaneously fed into an extruder (extrusion temperature 165℃, screw speed 35r / min). After vulcanization at 175℃ for 7 minutes, the flame-retardant foamed silicone rubber 5 filling layer inside the composite water pipe was obtained.

[0076] At least one aramid rope 6 is embedded in the flame-retardant foamed silicone rubber 5, extending along the length of the power line structure 2. The diameter of the aramid rope 6 is 1 mm, and the distance between it and the power line structure 2 and the communication line structure 3 is ≥ 2 mm. In this embodiment, one aramid rope 6 is embedded in the flame-retardant foamed silicone rubber 5.

[0077] The power cord structure 2 has a total outer diameter of 2.7 mm. From the inside out, the power cord structure 2 includes a power cord conductor layer 21, a power cord insulation layer 22, and a power cord shielding layer 23. The communication cord structure 3 has a total outer diameter of 2.0 mm. From the inside out, the communication cord structure 3 includes a communication cord conductor layer 31, a communication cord insulation layer 32, an aluminum-plastic composite tape layer 33, and a communication cord shielding layer 34.

[0078] The power cord conductor layer 21 is made of 0.2mm tin-plated electrolytic copper wire, 49 strands twisted together, with each core being 0.75mm thick. 2 The communication line conductor layer 31 is made of 0.1mm tin-plated oxygen-free copper wire, 24 strands twisted together, with each core being 0.15mm thick. 2 The power cord insulation layer 22 is made of polyvinyl chloride with a thickness of 0.9 mm, the communication line insulation layer 32 is made of linear low-density polyethylene with a thickness of 1.1 mm, the power cord shielding layer 23 and the communication line shielding layer 34 are both tin-plated copper wire braided shielding layers with a diameter of 0.12 mm, a braiding density of 90%, and a braiding angle of 35°.

[0079] The water pipe structure 4 includes, from the inside out, a water pipe body 41, a braided reinforcement layer 42, and a water pipe outer sheath 43. The water pipe body 41 has an inner diameter of 5 mm and a layer thickness of 0.8 mm. The water pipe body 41 is made of thermoplastic polyurethane elastomer. The braided reinforcement layer 42 is a mesh reinforcement layer woven from aramid fibers. The aramid fiber monofilament diameter is 0.1 mm, the braiding mesh count is 20 meshes / inch, the braiding angle of the braided reinforcement layer 42 is 50°, and the coverage is ≥90%. The water pipe outer sheath 43 is made of TPU and has a layer thickness of 0.5 mm.

[0080] In practical use, a certain length of the outer sheath 1, flame-retardant foamed silicone rubber 5 filling layer, and the corresponding power and communication line outer sheaths of both ends of the composite water pipe are peeled off to expose the internal power line conductor layer 21, communication line conductor layer 31, and water pipe structure 4. An integrated terminal board is installed on the UAV fuselage and ground equipment box. The integrated terminal board integrates a power interface, a communication interface, and a water interface. The power line conductor and communication line conductor of the composite water pipe are respectively connected to / inserted into the corresponding power interface and communication interface on the integrated terminal board, and the end of the water pipe structure 4 is connected to the water interface.

[0081] During operation, the operator only needs to connect and fix the treated ends of the composite water pipe to the integrated terminal board on the ground and the drone, respectively. In this way, the power supply, communication and water channels integrated inside the composite water pipe of the present invention can be connected separately and independently, thereby providing the drone with continuous power, control signals and cleaning medium, and realizing long-term uninterrupted operation.

[0082] Example 4

[0083] The difference from Example 1 is that no tetra-needle zinc oxide whiskers were added to the flame-retardant foamed silicone rubber 5.

[0084] Example 5

[0085] The difference from Example 1 is that the flame-retardant foamed silicone rubber 5 does not contain aramid ropes 6.

[0086] Performance testing

[0087] (1) Tensile strength test: Referring to the test principle of tensile strength in GB / T 2951.11-2008 "General Test Methods for Insulation and Sheath Materials of Cables and Optical Cables - Part 11: Measurement of Thickness and Dimensions - Mechanical Properties Test", 5 specimens with a length of 200 mm were cut from the composite water pipes of Examples 1-5. Resin clamp heads were cast at both ends of the specimens to retain their complete circular cross-section. The specimens were stretched at a tensile rate of 50 mm / min on an electronic tensile testing machine until they broke. The maximum breaking force (N) was recorded. The test results were the average of 5 tests. The test results are shown in Table 1 below.

[0088] (2) Repeated bending test: Referring to GB / T4909.11-2009 "Test methods for bare wires - Part 11: Repeated bending test", five 200mm long samples were cut from the composite water pipes of Examples 1-5. The samples were repeatedly bent on a special bending tester with a bending radius of 20mm and a bending angle of ±90°. The number of bends that the sample could withstand before failure (i.e., visible cracking of the sheath or breakage and protrusion of the internal cable / water pipe) was recorded. The test results were the average of the five tests. The test results are shown in Table 1 below.

[0089] (3) Flame retardant performance test: The test was conducted in accordance with GB / T 5169.16-2017 "Fire Hazard Tests for Electrical and Electronic Products - Part 16: Test Flame 50W Horizontal and Vertical Flame Test Method". Three 150mm long samples were cut from the composite water pipes of Examples 1-5 and fixed vertically in the test device. The lower end of the sample was ignited with a standard test flame (50W, about 20mm high) for 10s. The flame source was removed and the first flaming burning time (t1) of the sample was recorded. After the flame was extinguished, the same position was ignited again for 10s. The flame source was removed and the second flaming burning time (t2) and the subsequent flameless burning time (t3) were recorded. At the same time, the char height and whether there was any burning dripping that ignited the bottom layer (dry medical degreased cotton) below were observed and recorded. The test results were the average of the three tests. The test results are shown in Table 2 below.

[0090] Table 1. Results of Tensile Properties and Repeated Bending Tests

[0091] Maximum breaking force (N) Bending times Example 1 1850 >20000 (tested to 20000 times without failure) Example 2 2120 >20000 (tested to 20000 times without failure) Example 3 1980 >20000 (tested to 20000 times without failure) Example 4 1260 14000 Example 5 880 10000

[0092] Table 2. Test Results of Flame Retardant Performance

[0093] t1 (s) t2 (s) t3 (s) Char height (mm) Combustion drippings ignition underlayer Example 1 3.2 2.5 8.6 18 None Example 2 2.8 2.1 7.5 15 None Example 3 3.0 2.3 8.1 16 None Example 4 5.5 4.8 15.2 35 Yes Example 5 4.3 3.5 12.7 26 None

[0094] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A composite water pipe for cleaning drones, characterized in that: The device includes an outer sheath (1), which contains a power line structure (2), a communication line structure (3), and a water pipe structure (4). The power line structure (2) consists of a power line conductor layer (21), a power line insulation layer (22), and a power line shielding layer (23) from the inside to the outside. The communication line structure (3) consists of a communication line conductor layer (31), a communication line insulation layer (32), an aluminum-plastic composite tape layer (33), and a communication line shielding layer (34) from the inside to the outside. The water pipe structure (4) consists of a water pipe body (41), a braided reinforcement layer (42), and a water pipe outer sheath (43) from the inside to the outside. Flame-retardant foamed silicone rubber (5) is filled between the power line structure (2), the communication line structure (3), the water pipe structure (4), and the outer sheath (1).

2. The composite water pipe for cleaning drones according to claim 1, characterized in that: Both the power line shielding layer (23) and the communication line shielding layer (34) are tin-plated copper wire braided shielding layers.

3. The composite water pipe for cleaning drones according to claim 2, characterized in that: By weight, the flame-retardant foamed silicone rubber (5) comprises 100-110 parts methyl vinyl silicone rubber, 70-80 parts flame retardant, 3-5 parts tetraneedle zinc oxide whiskers, 3-5 parts azodicarbonamide, 1-2 parts sodium bicarbonate, 1.5-2 parts dicumyl peroxide, 10-15 parts silica, 2-3 parts hydroxyl silicone oil, 0.5-1 part carbon black, and 0.3-0.5 parts zinc stearate.

4. The composite water pipe for cleaning drones according to claim 3, characterized in that: The flame retardant comprises aluminum hydroxide, microencapsulated red phosphorus, and nano magnesium hydroxide in a mass ratio of 10:1.2:0.

8.

5. The composite water pipe for cleaning drones according to claim 1, characterized in that: At least one aramid rope (6) is embedded in the flame-retardant foamed silicone rubber (5) extending along the length direction of the power line structure (2).

6. The composite water pipe for cleaning drones according to claim 1, characterized in that: The communication line insulation layer (32) is made of linear low-density polyethylene, and the power line insulation layer (22) is made of polyvinyl chloride.

7. The composite water pipe for cleaning drones according to claim 1, characterized in that: The braided reinforcement layer (42) is a mesh reinforcement layer woven from aramid fibers. The braiding angle of the braided reinforcement layer (42) is 45°-55° and the coverage is ≥90%.

8. The composite water pipe for cleaning drones according to claim 1, characterized in that: The outer layer (1) of the sheath is made of polyurethane, and the outer sheath (43) of the water pipe is made of TPU.

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